<?php

/**
 * RFC 822 Email address list validation Utility
 *
 * What is it?
 *
 * This class will take an address string, and parse it into it's consituent
 * parts, be that either addresses, groups, or combinations. Nested groups
 * are not supported. The structure it returns is pretty straight forward,
 * and is similar to that provided by the imap_rfc822_parse_adrlist(). Use
 * print_r() to view the structure.
 *
 * How do I use it?
 *
 * $address_string = 'My Group: "Richard Heyes" <richard@localhost> (A comment), ted@example.com (Ted Bloggs), Barney;';
 * $structure = Mail_RFC822::parseAddressList($address_string, 'example.com', TRUE)
 * print_r($structure);
 *
 * @author  Richard Heyes <richard@phpguru.org>
 * @author  Chuck Hagenbuch <chuck@horde.org>
 * @version $Revision: 1.4 $
 * @package Mail
 */

class Mail_RFC822 {
	/**
	 * The address being parsed by the RFC822 object.
	 * @var string $address
	 */
	var $address = '';

	/**
	 * The default domain to use for unqualified addresses.
	 * @var string $default_domain
	 */
	var $default_domain = 'localhost';

	/**
	 * Should we return a nested array showing groups, or flatten everything?
	 * @var boolean $nestGroups
	 */
	var $nestGroups = true;

	/**
	 * Whether or not to validate atoms for non-ascii characters.
	 * @var boolean $validate
	 */
	var $validate = true;

	/**
	 * The array of raw addresses built up as we parse.
	 * @var array $addresses
	 */
	var $addresses = array();

	/**
	 * The final array of parsed address information that we build up.
	 * @var array $structure
	 */
	var $structure = array();

	/**
	 * The current error message, if any.
	 * @var string $error
	 */
	var $error = null;

	/**
	 * An internal counter/pointer.
	 * @var integer $index
	 */
	var $index = null;

	/**
	 * The number of groups that have been found in the address list.
	 * @var integer $num_groups
	 * @access public
	 */
	var $num_groups = 0;

	/**
	 * A variable so that we can tell whether or not we're inside a
	 * Mail_RFC822 object.
	 * @var boolean $mailRFC822
	 */
	var $mailRFC822 = true;

	/**
	 * A limit after which processing stops
	 * @var int $limit
	 */
	var $limit = null;


	/**
	 * Sets up the object. The address must either be set here or when
	 * calling parseAddressList(). One or the other.
	 *
	 * @access public
	 * @param string  $address		 The address(es) to validate.
	 * @param string  $default_domain  Default domain/host etc. If not supplied, will be set to localhost.
	 * @param boolean $nest_groups	 Whether to return the structure with groups nested for easier viewing.
	 * @param boolean $validate		Whether to validate atoms. Turn this off if you need to run addresses through before encoding the personal names, for instance.
	 *
	 * @return object Mail_RFC822 A new Mail_RFC822 object.
	 */
	function Mail_RFC822($address = null, $default_domain = null, $nest_groups = null, $validate = null, $limit = null) {
		if (isset($address))
			$this->address = $address;
		if (isset($default_domain))
			$this->default_domain = $default_domain;
		if (isset($nest_groups))
			$this->nestGroups = $nest_groups;
		if (isset($validate))
			$this->validate = $validate;
		if (isset($limit))
			$this->limit = $limit;
	}

	/**
	 * Starts the whole process. The address must either be set here
	 * or when creating the object. One or the other.
	 *
	 * @access public
	 * @param string  $address		 The address(es) to validate.
	 * @param string  $default_domain  Default domain/host etc.
	 * @param boolean $nest_groups	 Whether to return the structure with groups nested for easier viewing.
	 * @param boolean $validate		Whether to validate atoms. Turn this off if you need to run addresses through before encoding the personal names, for instance.
	 *
	 * @return array A structured array of addresses.
	 */
	function parseAddressList($address = null, $default_domain = null, $nest_groups = null, $validate = null, $limit = null) {

		if (!isset($this->mailRFC822)) {
			$obj = new Mail_RFC822($address, $default_domain, $nest_groups, $validate, $limit);
			return $obj->parseAddressList();
		}

		if (isset($address))
			$this->address = $address;
		if (isset($default_domain))
			$this->default_domain = $default_domain;
		if (isset($nest_groups))
			$this->nestGroups = $nest_groups;
		if (isset($validate))
			$this->validate = $validate;
		if (isset($limit))
			$this->limit = $limit;

		$this->structure = array();
		$this->addresses = array();
		$this->error = null;
		$this->index = null;

		while ($this->address = $this->_splitAddresses($this->address)) {
			continue;
		}

		if ($this->address === false or isset($this->error)) {
			return false;
		}

		// Reset timer since large amounts of addresses can take a long time to
		// get here
		set_time_limit(30);

		// Loop through all the addresses
		for ($i = 0; $i < count($this->addresses); $i++) {

			if (($return = $this->_validateAddress($this->addresses[$i])) === false or isset($this->error)) {
				return false;
			}

			if (!$this->nestGroups) {
				$this->structure = array_merge($this->structure, $return);
			} else {
				$this->structure[] = $return;
			}
		}

		return $this->structure;
	}

	/**
	 * Splits an address into seperate addresses.
	 *
	 * @access private
	 * @param string $address The addresses to split.
	 * @return boolean Success or failure.
	 */
	function _splitAddresses($address) {

		if (!empty($this->limit) and count($this->addresses) == $this->limit) {
			return '';
		}

		if ($this->_isGroup($address) and !isset($this->error)) {
			$split_char = ';';
			$is_group = true;
		} elseif (!isset($this->error)) {
			$split_char = ',';
			$is_group = false;
		} elseif (isset($this->error)) {
			return false;
		}

		// Split the string based on the above ten or so lines.
		$parts = explode($split_char, $address);
		$string = $this->_splitCheck($parts, $split_char);

		// If a group...
		if ($is_group) {
			// If $string does not contain a colon outside of
			// brackets/quotes etc then something's fubar.

			// First check there's a colon at all:
			if (mb_strpos($string, ':') === false) {
				$this->error = 'Invalid address: ' . $string;
				return false;
			}

			// Now check it's outside of brackets/quotes:
			if (!$this->_splitCheck(explode(':', $string), ':'))
				return false;

			// We must have a group at this point, so increase the counter:
			$this->num_groups++;
		}

		// $string now contains the first full address/group.
		// Add to the addresses array.
		$this->addresses[] = array(
			'address' => trim($string),
			'group' => $is_group
		);

		// Remove the now stored address from the initial line, the +1
		// is to account for the explode character.
		$address = trim(mb_substr($address, mb_strlen($string) + 1));

		// If the next char is a comma and this was a group, then
		// there are more addresses, otherwise, if there are any more
		// chars, then there is another address.
		if ($is_group and mb_substr($address, 0, 1) == ',') {
			$address = trim(mb_substr($address, 1));
			return $address;

		} elseif (mb_strlen($address) > 0) {
			return $address;

		} else {
			return '';
		}

		// If you got here then something's off
		return false;
	}

	/**
	 * Checks for a group at the start of the string.
	 *
	 * @access private
	 * @param string $address The address to check.
	 * @return boolean Whether or not there is a group at the start of the string.
	 */
	function _isGroup($address) {
		// First comma not in quotes, angles or escaped:
		$parts = explode(',', $address);
		$string = $this->_splitCheck($parts, ',');

		// Now we have the first address, we can reliably check for a
		// group by searching for a colon that's not escaped or in
		// quotes or angle brackets.
		if (count($parts = explode(':', $string)) > 1) {
			$string2 = $this->_splitCheck($parts, ':');
			return ($string2 !== $string);
		} else {
			return false;
		}
	}

	/**
	 * A common function that will check an exploded string.
	 *
	 * @access private
	 * @param array $parts The exloded string.
	 * @param string $char  The char that was exploded on.
	 * @return mixed False if the string contains unclosed quotes/brackets, or the string on success.
	 */
	function _splitCheck($parts, $char) {
		$string = $parts[0];

		for ($i = 0; $i < count($parts); $i++) {
			if ($this->_hasUnclosedQuotes($string) or $this->_hasUnclosedBrackets($string, '<>') or $this->_hasUnclosedBrackets($string, '[]') or $this->_hasUnclosedBrackets($string, '()') or mb_substr($string, -1) == '\\') {
				if (isset($parts[$i + 1])) {
					$string = $string . $char . $parts[$i + 1];
				} else {
					$this->error = 'Invalid address spec. Unclosed bracket or quotes';
					return false;
				}
			} else {
				$this->index = $i;
				break;
			}
		}

		return $string;
	}

	/**
	 * Checks if a string has an unclosed quotes or not.
	 *
	 * @access private
	 * @param string $string The string to check.
	 * @return boolean True if there are unclosed quotes inside the string, false otherwise.
	 */
	function _hasUnclosedQuotes($string) {
		$string = explode('"', $string);
		$string_cnt = count($string);

		for ($i = 0; $i < (count($string) - 1); $i++)
			if (mb_substr($string[$i], -1) == '\\')
				$string_cnt--;

		return ($string_cnt % 2 === 0);
	}

	/**
	 * Checks if a string has an unclosed brackets or not. IMPORTANT:
	 * This function handles both angle brackets and square brackets;
	 *
	 * @access private
	 * @param string $string The string to check.
	 * @param string $chars  The characters to check for.
	 * @return boolean True if there are unclosed brackets inside the string, false otherwise.
	 */
	function _hasUnclosedBrackets($string, $chars) {
		$num_angle_start = substr_count($string, $chars[0]);
		$num_angle_end = substr_count($string, $chars[1]);

		$this->_hasUnclosedBracketsSub($string, $num_angle_start, $chars[0]);
		$this->_hasUnclosedBracketsSub($string, $num_angle_end, $chars[1]);

		if ($num_angle_start < $num_angle_end) {
			$this->error = 'Invalid address spec. Unmatched quote or bracket (' . $chars . ')';
			return false;
		} else {
			return ($num_angle_start > $num_angle_end);
		}
	}

	/**
	 * Sub function that is used only by hasUnclosedBrackets().
	 *
	 * @access private
	 * @param string $string The string to check.
	 * @param integer &$num	The number of occurrences.
	 * @param string $char   The character to count.
	 * @return integer The number of occurrences of $char in $string, adjusted for backslashes.
	 */
	function _hasUnclosedBracketsSub($string, &$num, $char) {
		$parts = explode($char, $string);
		for ($i = 0; $i < count($parts); $i++) {
			if (mb_substr($parts[$i], -1) == '\\' or $this->_hasUnclosedQuotes($parts[$i]))
				$num--;
			if (isset($parts[$i + 1]))
				$parts[$i + 1] = $parts[$i] . $char . $parts[$i + 1];
		}

		return $num;
	}

	/**
	 * Function to begin checking the address.
	 *
	 * @access private
	 * @param string $address The address to validate.
	 * @return mixed False on failure, or a structured array of address information on success.
	 */
	function _validateAddress($address) {
		$is_group = false;

		if ($address['group']) {
			$is_group = true;

			// Get the group part of the name
			$parts = explode(':', $address['address']);
			$groupname = $this->_splitCheck($parts, ':');
			$structure = array();

			// And validate the group part of the name.
			if (!$this->_validatePhrase($groupname)) {
				$this->error = 'Group name did not validate.';
				return false;
			} else {
				// Don't include groups if we are not nesting
				// them. This avoids returning invalid addresses.
				if ($this->nestGroups) {
					$structure = new stdClass;
					$structure->groupname = $groupname;
				}
			}

			$address['address'] = ltrim(mb_substr($address['address'], mb_strlen($groupname . ':')));
		}

		// If a group then split on comma and put into an array.
		// Otherwise, Just put the whole address in an array.
		if ($is_group) {
			while (mb_strlen($address['address']) > 0) {
				$parts = explode(',', $address['address']);
				$addresses[] = $this->_splitCheck($parts, ',');
				$address['address'] = trim(mb_substr($address['address'], mb_strlen(end($addresses) . ',')));
			}
		} else {
			$addresses[] = $address['address'];
		}

		// Check that $addresses is set, if address like this:
		// Groupname:;
		// Then errors were appearing.
		if (!isset($addresses)) {
			$this->error = 'Empty group.';
			return false;
		}

		for ($i = 0; $i < count($addresses); $i++) {
			$addresses[$i] = trim($addresses[$i]);
		}

		// Validate each mailbox.
		// Format could be one of: name <geezer@domain.com>
		//						 geezer@domain.com
		//						 geezer
		// ... or any other format valid by RFC 822.
		array_walk($addresses, array(
			$this,
			'validateMailbox'
		));

		// Nested format
		if ($this->nestGroups) {
			if ($is_group) {
				$structure->addresses = $addresses;
			} else {
				$structure = $addresses[0];
			}

			// Flat format
		} else {
			if ($is_group) {
				$structure = array_merge($structure, $addresses);
			} else {
				$structure = $addresses;
			}
		}

		return $structure;
	}

	/**
	 * Function to validate a phrase.
	 *
	 * @access private
	 * @param string $phrase The phrase to check.
	 * @return boolean Success or failure.
	 */
	function _validatePhrase($phrase) {
		// Splits on one or more Tab or space.
		$parts = preg_split('/[ \\x09]+/', $phrase, -1, PREG_SPLIT_NO_EMPTY);

		$phrase_parts = array();
		while (count($parts) > 0) {
			$phrase_parts[] = $this->_splitCheck($parts, ' ');
			for ($i = 0; $i < $this->index + 1; $i++)
				array_shift($parts);
		}

		for ($i = 0; $i < count($phrase_parts); $i++) {
			// If quoted string:
			if (mb_substr($phrase_parts[$i], 0, 1) == '"') {
				if (!$this->_validateQuotedString($phrase_parts[$i]))
					return false;
				continue;
			}

			// Otherwise it's an atom:
			if (!$this->_validateAtom($phrase_parts[$i]))
				return false;
		}

		return true;
	}

	/**
	 * Function to validate an atom which from rfc822 is:
	 * atom = 1*<any CHAR except specials, SPACE and CTLs>
	 *
	 * If validation ($this->validate) has been turned off, then
	 * validateAtom() doesn't actually check anything. This is so that you
	 * can split a list of addresses up before encoding personal names
	 * (umlauts, etc.), for example.
	 *
	 * @access private
	 * @param string $atom The string to check.
	 * @return boolean Success or failure.
	 */
	function _validateAtom($atom) {
		if (!$this->validate) {
			// Validation has been turned off; assume the atom is okay.
			return true;
		}

		// Check for any char from ASCII 0 - ASCII 127
		if (!preg_match('/^[\\x00-\\x7E]+$/i', $atom, $matches)) {
			return false;
		}

		// Check for specials:
		if (preg_match('/[][()<>@,;\\:". ]/', $atom)) {
			return false;
		}

		// Check for control characters (ASCII 0-31):
		if (preg_match('/[\\x00-\\x1F]+/', $atom)) {
			return false;
		}

		return true;
	}

	/**
	 * Function to validate quoted string, which is:
	 * quoted-string = <"> *(qtext/quoted-pair) <">
	 *
	 * @access private
	 * @param string $qstring The string to check
	 * @return boolean Success or failure.
	 */
	function _validateQuotedString($qstring) {
		// Leading and trailing "
		$qstring = mb_substr($qstring, 1, -1);

		// Perform check.
		return !(preg_match('/(.)[\x0D\\\\"]/', $qstring, $matches) and $matches[1] != '\\');
	}

	/**
	 * Function to validate a mailbox, which is:
	 * mailbox =   addr-spec		 ; simple address
	 *		   / phrase route-addr ; name and route-addr
	 *
	 * @access public
	 * @param string &$mailbox The string to check.
	 * @return boolean Success or failure.
	 */
	function validateMailbox(&$mailbox) {
		// A couple of defaults.
		$phrase = '';
		$comment = '';

		// Catch any RFC822 comments and store them separately
		$_mailbox = $mailbox;
		while (mb_strlen(trim($_mailbox)) > 0) {
			$parts = explode('(', $_mailbox);
			$before_comment = $this->_splitCheck($parts, '(');
			if ($before_comment != $_mailbox) {
				// First char should be a (
				$comment = mb_substr(str_replace($before_comment, '', $_mailbox), 1);
				$parts = explode(')', $comment);
				$comment = $this->_splitCheck($parts, ')');
				$comments[] = $comment;

				// +1 is for the trailing )
				$_mailbox = mb_substr($_mailbox, mb_strpos($_mailbox, $comment) + mb_strlen($comment) + 1);
			} else {
				break;
			}
		}

		for ($i = 0; $i < count(@$comments); $i++) {
			$mailbox = str_replace('(' . $comments[$i] . ')', '', $mailbox);
		}
		$mailbox = trim($mailbox);

		// Check for name + route-addr
		if (mb_substr($mailbox, -1) == '>' and mb_substr($mailbox, 0, 1) != '<') {
			$parts = explode('<', $mailbox);
			$name = $this->_splitCheck($parts, '<');

			$phrase = trim($name);
			$route_addr = trim(mb_substr($mailbox, mb_strlen($name . '<'), -1));

			if ($this->_validatePhrase($phrase) === false or ($route_addr = $this->_validateRouteAddr($route_addr)) === false)
				return false;

			// Only got addr-spec
		} else {
			// First snip angle brackets if present.
			if (mb_substr($mailbox, 0, 1) == '<' and mb_substr($mailbox, -1) == '>')
				$addr_spec = mb_substr($mailbox, 1, -1);
			else
				$addr_spec = $mailbox;

			if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false)
				return false;
		}

		// Construct the object that will be returned.
		$mbox = new stdClass();

		// Add the phrase (even if empty) and comments
		$mbox->personal = $phrase;
		$mbox->comment = isset($comments) ? $comments : array();

		if (isset($route_addr)) {
			$mbox->mailbox = $route_addr['local_part'];
			$mbox->host = $route_addr['domain'];
			$route_addr['adl'] !== '' ? $mbox->adl = $route_addr['adl'] : '';
		} else {
			$mbox->mailbox = $addr_spec['local_part'];
			$mbox->host = $addr_spec['domain'];
		}

		$mailbox = $mbox;
		return true;
	}

	/**
	 * This function validates a route-addr which is:
	 * route-addr = "<" [route] addr-spec ">"
	 *
	 * Angle brackets have already been removed at the point of
	 * getting to this function.
	 *
	 * @access private
	 * @param string $route_addr The string to check.
	 * @return mixed False on failure, or an array containing validated address/route information on success.
	 */
	function _validateRouteAddr($route_addr) {
		// Check for colon.
		if (mb_strpos($route_addr, ':') !== false) {
			$parts = explode(':', $route_addr);
			$route = $this->_splitCheck($parts, ':');
		} else {
			$route = $route_addr;
		}

		// If $route is same as $route_addr then the colon was in
		// quotes or brackets or, of course, non existent.
		if ($route === $route_addr) {
			unset($route);
			$addr_spec = $route_addr;
			if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false) {
				return false;
			}
		} else {
			// Validate route part.
			if (($route = $this->_validateRoute($route)) === false) {
				return false;
			}

			$addr_spec = mb_substr($route_addr, mb_strlen($route . ':'));

			// Validate addr-spec part.
			if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false) {
				return false;
			}
		}

		if (isset($route)) {
			$return['adl'] = $route;
		} else {
			$return['adl'] = '';
		}

		$return = array_merge($return, $addr_spec);
		return $return;
	}

	/**
	 * Function to validate a route, which is:
	 * route = 1#("@" domain) ":"
	 *
	 * @access private
	 * @param string $route The string to check.
	 * @return mixed False on failure, or the validated $route on success.
	 */
	function _validateRoute($route) {
		// Split on comma.
		$domains = explode(',', trim($route));

		for ($i = 0; $i < count($domains); $i++) {
			$domains[$i] = str_replace('@', '', trim($domains[$i]));
			if (!$this->_validateDomain($domains[$i]))
				return false;
		}

		return $route;
	}

	/**
	 * Function to validate a domain, though this is not quite what
	 * you expect of a strict internet domain.
	 *
	 * domain = sub-domain *("." sub-domain)
	 *
	 * @access private
	 * @param string $domain The string to check.
	 * @return mixed False on failure, or the validated domain on success.
	 */
	function _validateDomain($domain) {
		// Note the different use of $subdomains and $sub_domains
		$subdomains = explode('.', $domain);

		while (count($subdomains) > 0) {
			$sub_domains[] = $this->_splitCheck($subdomains, '.');
			for ($i = 0; $i < $this->index + 1; $i++)
				array_shift($subdomains);
		}

		for ($i = 0; $i < count($sub_domains); $i++) {
			if (!$this->_validateSubdomain(trim($sub_domains[$i])))
				return false;
		}

		// Managed to get here, so return input.
		return $domain;
	}

	/**
	 * Function to validate a subdomain:
	 *   subdomain = domain-ref / domain-literal
	 *
	 * @access private
	 * @param string $subdomain The string to check.
	 * @return boolean Success or failure.
	 */
	function _validateSubdomain($subdomain) {
		if (preg_match('|^\[(.*)]$|', $subdomain, $arr)) {
			if (!$this->_validateDliteral($arr[1]))
				return false;
		} else {
			if (!$this->_validateAtom($subdomain))
				return false;
		}

		// Got here, so return successful.
		return true;
	}

	/**
	 * Function to validate a domain literal:
	 *   domain-literal =  "[" *(dtext / quoted-pair) "]"
	 *
	 * @access private
	 * @param string $dliteral The string to check.
	 * @return boolean Success or failure.
	 */
	function _validateDliteral($dliteral) {
		return !preg_match('/(.)[][\x0D\\\\]/', $dliteral, $matches) and $matches[1] != '\\';
	}

	/**
	 * Function to validate an addr-spec.
	 *
	 * addr-spec = local-part "@" domain
	 *
	 * @access private
	 * @param string $addr_spec The string to check.
	 * @return mixed False on failure, or the validated addr-spec on success.
	 */
	function _validateAddrSpec($addr_spec) {
		$addr_spec = trim($addr_spec);

		// Split on @ sign if there is one.
		if (mb_strpos($addr_spec, '@') !== false) {
			$parts = explode('@', $addr_spec);
			$local_part = $this->_splitCheck($parts, '@');
			$domain = mb_substr($addr_spec, mb_strlen($local_part . '@'));

			// No @ sign so assume the default domain.
		} else {
			$local_part = $addr_spec;
			$domain = $this->default_domain;
		}

		if (($local_part = $this->_validateLocalPart($local_part)) === false)
			return false;
		if (($domain = $this->_validateDomain($domain)) === false)
			return false;

		// Got here so return successful.
		return array(
			'local_part' => $local_part,
			'domain' => $domain
		);
	}

	/**
	 * Function to validate the local part of an address:
	 *   local-part = word *("." word)
	 *
	 * @access private
	 * @param string $local_part
	 * @return mixed False on failure, or the validated local part on success.
	 */
	function _validateLocalPart($local_part) {
		$parts = explode('.', $local_part);

		// Split the local_part into words.
		while (count($parts) > 0) {
			$words[] = $this->_splitCheck($parts, '.');
			for ($i = 0; $i < $this->index + 1; $i++) {
				array_shift($parts);
			}
		}

		// Validate each word.
		for ($i = 0; $i < count($words); $i++) {
			if ($this->_validatePhrase(trim($words[$i])) === false)
				return false;
		}

		// Managed to get here, so return the input.
		return $local_part;
	}

	/**
	 * Returns an approximate count of how many addresses are
	 * in the given string. This is APPROXIMATE as it only splits
	 * based on a comma which has no preceding backslash. Could be
	 * useful as large amounts of addresses will end up producing
	 * *large* structures when used with parseAddressList().
	 *
	 * @param  string $data Addresses to count
	 * @return int		  Approximate count
	 */
	function approximateCount($data) {
		return count(preg_split('/(?<!\\\\),/', $data));
	}

	/**
	 * This is a email validating function seperate to the rest
	 * of the class. It simply validates whether an email is of
	 * the common internet form: <user>@<domain>. This can be
	 * sufficient for most people. Optional stricter mode can
	 * be utilised which restricts mailbox characters allowed
	 * to alphanumeric, full stop, hyphen and underscore.
	 *
	 * @param  string  $data   Address to check
	 * @param  boolean $strict Optional stricter mode
	 * @return mixed		   False if it fails, an indexed array
	 *						 username/domain if it matches
	 */
	function isValidInetAddress($data, $strict = false) {
		$regex = $strict ? '/^([.0-9a-z_-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,4})$/i' : '/^([*+!.&#$|\'\\%\/0-9a-z^_`{}=?~:-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,4})$/i';
		if (preg_match($regex, trim($data), $matches)) {
			return array(
				$matches[1],
				$matches[2]
			);
		} else {
			return false;
		}
	}
}

?>